package com.itheima.interceptors;

import com.itheima.utils.JwtUtil;
import com.itheima.utils.ThreadLocalUtil;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import java.util.Map;

// 定义一个全局拦截器
@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.取到token
        String token = request.getHeader("Authorization");
        // 2.验证token
        try {

            // 校验redis中的token
            ValueOperations<String, String> operations = stringRedisTemplate.opsForValue();
            String redistoken = operations.get(token);
            if(redistoken == null){
                throw new Exception("tokon异常");
            }


            Map<String, Object> claims = JwtUtil.parseToken(token);

            // 存入ThreadLocalUtil
            ThreadLocalUtil.set(claims);
            return true;
        }catch (Exception e) {
            response.setStatus(401);
            System.out.println("401错误-》请求头中没有携带token参数！");
            return false;
        }
    }

    // 销毁进程
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        ThreadLocalUtil.remove();
    }
}
